When is the time of transferring of the ownership of the object after the sale contract has taken effect? Will the validity of transferring the ownership of the object be affected by the invalidity or revocation of the sale contract? It is the basic problem of real rights. The United Nations Convention on Contracts for the International Sale of Goods signed on April 1,1980 holds no views on this issue in principle but let it be resolved by each country respectively instead. However, with the coming legislation of the civil laws in Europe as well as that of the Law of Real Right in China, this issue will become again the focus of discussion. The general sentiment of our scholars holds that the principle of abstract nature alternation of real right in our country has inherited from that in German laws. The aspect adopted hereof is from the legal historiography and comparative jurisprudence to analyze and compare the civil laws in European countries, and what we have observed is that Article 758 and the former part of Article 761. 1 of Civil Law of R. O. C are similar to Article 656. 1 and Article 714. 1 of Civil Law of Swiss but less similar to Article 873. 1 and Article 929 of that of Germany. In other words, in terms of legislation, the Civil Law of R. O. C is similar to that of Swiss. On the contrary, however, the general sentiment adopted by our scholars tends to adopt the concept of “principle of abstract nature alternation of real right” inherited from Germany; which can be called “Theory Inheritance”. Comparing respective civil laws of different countries herein, we discover the principle of abstract nature of real right in German law could coincide best with the intentions of parties to a sale contract, provide better protection for the transaction safety, and has the most advantages. Therefore, we suggest amending the law with the principle of abstract nature of real right.